oj.uz

Submission #972168

# Submission time Handle Problem Language Result Execution time Memory
972168 2024-04-30T08:04:25 Z Circling Ekoeko (COCI21_ekoeko) C++17
20 / 110
 9 ms 4320 KB 
/*The British Royal Family and a small cadre of English Fabian Socialists, in
conjunction with the Rockefellers and the Rothchilds, are engaged in a
conspiracy to greatly reduce the population of the human race in order to head
off a Malthusian catastrophe, a catastrophe that could easily be avoided by
simply building a massive amount of nuclear power plants and a number of massive
superhighways and bridges to connect all of the world's continents. But doing
that would cut into the conspiracy's profits. So the British Royal Family
invented environmentalism and neoliberalism in order to hide the truth. And in
order to further reduce the population, the British Royal Family is also the
world's foremost drug trafficking conspiracy. And it uses its control of the IMF
to push austerity in order to kill as many people in the global south as
possible.
And also Henry Kissinger is a gay KGB agent. */
#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
using namespace std;


int invcount(int *arr, int n){
    if (n < 2) return 0;
    int arr1[n / 2];
    for (int i = 0; i < n / 2; i++) arr1[i] = arr[i];
    int arr2[n - n / 2];
    for (int i = n / 2; i < n; i++) arr2[i - n / 2] = arr[i];
    int ans = invcount(arr1, n / 2) + invcount(arr2, n  - n / 2);
    int p1 = 0, p2 = 0;
    while (p1 + p2 < n){
        if (p2 == n - n / 2){
            arr[p1 + p2] = arr1[p1];
            p1++;
        } else if (p1 == n / 2){
            arr[p1 + p2] = arr2[p2];
            p2++;
        } else if (arr1[p1] < arr2[p2]){
            arr[p1 + p2] = arr1[p1];
            p1++;
        } else {
            arr[p1 + p2] = arr2[p2];
            ans += n / 2 - p1;
            p2++;
        }
    }
    return ans;
}


int otherend[200000], rightend[100000];
pair<int, int> pairarr[100000];


int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(0);
    int n, cntr = 0, ans, closedcount = 0;
    char c;
    cin >> n;
    vector<vector<int>> appr;
    appr.resize(26);
    for (int i = 0; i < 2 * n; i++){
        cin >> c;
        appr[c - 'a'].push_back(i);
    }
    for (int i = 0; i < 26; i++){
        for (uint32_t j = 0; j < appr[i].size() / 2; j++){
            otherend[appr[i][j]] = appr[i][j + appr[i].size() / 2];
            otherend[appr[i][j + appr[i].size() / 2]] = appr[i][j];
            pairarr[cntr] = {appr[i][j], appr[i][j + appr[i].size() / 2]};
            cntr++;
        }
    }
    sort(pairarr, pairarr + n);
    for (int i = 0; i < n; i++) rightend[i] = pairarr[i].second;
    ans = invcount(rightend, n);
    for (int i = 0; i < 2 * n; i++){
        if (i < otherend[i]) ans += closedcount;
        else closedcount++;
    }
    cout << ans;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1628 KB Output is correct
3 Correct 6 ms 2908 KB Output is correct
4 Incorrect 9 ms 4320 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1628 KB Output is correct
3 Correct 6 ms 2908 KB Output is correct
4 Incorrect 9 ms 4320 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1628 KB Output is correct
3 Correct 6 ms 2908 KB Output is correct
4 Incorrect 9 ms 4320 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 464 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 508 KB Output is correct
11 Correct 1 ms 600 KB Output is correct

Subtask #5
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 4 ms 1628 KB Output is correct
3 Correct 6 ms 2908 KB Output is correct
4 Incorrect 9 ms 4320 KB Output isn't correct
5 Halted 0 ms 0 KB -